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SECTION l-DOCUMENTARY, 8mm. FILMS
(d) POPULAR SCIENCE
83101 Hot Air Heating 1 Reel
Scenes, supplemented by animations, trace the development of heating methods from fireplace and stove to a modern hot air system in a large building.
83112 Compressed Air 1 Reel
Enumerates the principles underlying the compression of air and its practical applications to the Bessemer converter, railway air brakes, air-driven tools, and the fire engine.
83113 The Water Cycle 1 Reel
Graphic presentation of the continuous circulation of water, from earth to sky and back to earth. Examples of each stage in the cj'cle are given.
83117 Purifying Water 1 Reel
Stresses the need for purifying water, and shows methods of aerating, filtering, disinfecting and testing a city's water supply.
83122 Atmospheric Pressure 1 Reel
Illustrations of unbalanced air pressure, including the well-known "Magdeburg" hemispheres demonstration. Atmospheric variations in pressure between valley and hill-top and between land and water are clearly shown.
83128 Water Power 1 Reel
Shows the relationship between water power and electricity. Water wheels, high and low head developments, hydro-electric generators, the turbine and the transmission and uses of electric power are seen and explained.
83137 Simple Machines 1 Reel
Such simple machines as the lever and the inclined plane are shown to be fundamental to complex ones. Elementary principles of mechanics — moments, work, energy, and efficiency— are demonstrated.
83141 Four-Stroke-Cycle Gas Engine 1 Reel
Demonstrates the "four-stroke" cycle in a single cylinder "T" head type of motor. The firing of a cannon is compared with the gasengine cycle. The fuel system of an engine,
Order by numbers. FOR PRICES SEE PAGE 3